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Share based payments - Outstanding stock options (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of shares on conversion 1  
Total share based payment expense $ 70 $ 72
Tranche One    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting percentage 33.33%  
Tranche Two    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting percentage 2.78%